Bending conduit 20mm crease

[gazdkw82]

been doing some install work with upvc 20mm conduit.

I got myself a bending spring but when I do the bends I tend to get a crease on the inside
of the bend. I rub the conduit back and forth inside my hand to warm the conduit up prior to bending. Same process I did at college but never got the crease at college.

Could it be the spring?

 

[Leesparkykent]

yeah you get different springs for different gauge conduit...Light gauge, heavy gauge etc

 

[gazdkw82]

Well I ordered 20mm spring.

I didn't know there was different gauges

 

[gazdkw82]

This is the one I got. It says heavy gauge. So would I need light gauge?

 

[telectrix]

it could be the actual conduit. some makes are a pig to get a nice bend.

 

[GMES]

It may seem a daft question Gaz, but you did make sure the spring was in far enough as I've seen this cause the conduit to crease in the past.

 

[gazdkw82]

I always measure so the bend is in the middle of the spring.

Conduit was from screwfix so unsure on brand

 

[Leesparkykent]

If it was from screwfix the brand would of been tower and heavy gauge. Ive never used it myself so cant say what the quality is like but as telectrix has said it could be the quality of the conduit as you have a heavy gauge spring. You might have to get the conduit really warm to get a good bend.

 

[gazdkw82]

Better start taking a hair dryer with me lol

 

[Marvo]

Try just warming the outside of the bend and leave the inside cooler, it helps sometimes with the thicker conduit gauges.

 

[gazdkw82]

And how do you do that?

 

[Pete999]

Could be you are trying to make the bend to tight.

 

[gazdkw82]

I think that could be true actually pete. Because the bend was right towards the end of the conduit tube there was no way I would have enough tube to work with to bend with my knee.

So i bent it around a metal handrail, about the same diameter as a deodorant can. Perhaps it was too tight a bend

 

[Pete999]

I think that could be true actually pete. Because the bend was right towards the end of the conduit tube there was no way I would have enough tube to work with to bend with my knee.

So i bent it around a metal handrail, about the same diameter as a deodorant can. Perhaps it was too tight a bend

Yep far to tight a bend from your description, sometime to form a critical bend you may have to sacrifice some tube.

 

[Marvo]

And how do you do that?

Either with a heat gun or rub it hard with your hand.